Name: 【TED】Dina Katabi: A new way to monitor vital signs (that can see through walls) (A new way to monitor vital signs (that can see through walls) | Dina Katabi)
Uploaded: 2018-08-09T16:17:03.000Z
Duration: 13 min 18 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

I was, like many of you in this room, very much fascinated by Star Wars,

and what fascinated me the most is this notion of the Force,

this energy that connects all people and all objects

and allows you to feel people that you can't even see.

And I remember many nights, I would be sitting at home,

just, like, concentrating and focusing, trying to feel the Force,

I joined the MIT faculty and started working on wireless signals.

These are things like Wi-Fi or cellular systems,

But then, again, this Force thing kept nagging me,

"Wait a minute, these wireless signals -- they are like the Force."

wireless signals, they travel through space,

they go through obstacles and walls and occlusions,

they reflect off our bodies, because our bodies are full of water,

And if, just if, I had a device that can just sense these minute reflections,

then I would be able to feel people that I cannot see.

So I started working with my students on building such a device,

and I want to show you some of our early results.

And we are going to put the device in the other office, behind the wall,

and we are going to monitor him as he moves.

This red dot is tracking him using wireless signals.

And as you can see, the red dot is tracking his movements very accurately,

purely based on how his body interacts with the surrounding wireless signals.

how is it possible that we can sense people

and track them, without any wearables, through walls,

and the easiest analogy to think about is radar.

I'm sure many of you have seen this picture.

You transmit a wireless signal to the sky,

it reflects off some airplane, comes back to you,

you can't, like radar, just blast wireless power at somebody.

You're going to fry them like if they were in a microwave.

So it means that you have to be able to deal with very weak signals,

and that means that your device has to be very sensitive.

The second difference is that, unlike the sky, where it's empty --

if you are lucky, there is one airplane that you can catch there.

and look how many objects and people there are.

So in indoor environments, the signal not only reflects off the person,

if reflects off the person, off the floor, the ceiling,

where the same signal reflects off me and then off you,

and then off the ceiling, then off the floor.

The first thing is radiotechnologies have evolved a lot,

radio technology became much more powerful,

so we were able to build very sensitive radios

that can sense weak and minute RF signals.

So you keep hearing about machine learning

and there was a revolution of machine learning recently,

and that allowed us to build machine-learning models

that can understand wireless signals and interpret them

so they would know what happened in the environment.

So if you think of it, the radio is like the ear of our device

and the machine learning is like the brain,

and together, they have a very powerful device.

So what else can we sense about people using wireless signals?

Sleep, actually, is something very dear to my heart,

So one thing is when you start working on some physiological signal

because the person walks and the device sees him as he walks to bed,

and that measure of sleep is what people call actigraphy.

But it turned out that we can actually get sleep

【TED】Dina Katabi: A new way to monitor vital signs (that can see through walls) (A new way to monitor vital signs (that can see through walls) | Dina Katabi)

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【TED】Dina Katabi: A new way to monitor vital signs (that can see through walls) (A new way to monitor vital signs (that can see through walls) | Dina Katabi)

chronic

depression

positive

applause